Vent shaft no2 along the chiltern tunnel. Situated off the A413 road, past Chalfont St Giles, in the Chilterns.
The ventilation shafts serve 2 main purposes: to allow emergency evacuation and access, also housing the fans to allow for air dispersion.
New temporaty access road built specifically for the HS2 works. Will update with more details about the numerous buildings...though i believe the largest structure is clled the Headhouse and the smallest is for the fans. Note the landscaping behing the buildings which used spoil from the excavation. Infiltration pond…
Externally, things appear to be at an advanced state of completion.
Edit far building with single sloping roof is transformer substation
